Graph
Year | Totals | Observation hours |
---|---|---|
1971 | 84 | 1:15 |
1972 | 0 | 0:30 |
1974 | 569 | 6:30 |
1977 | 146 | 2:30 |
1982 | 377 | 1:50 |
1983 | 1031 | 13:30 |
1984 | 704 | 12:30 |
1985 | 265 | 20:15 |
1986 | 80 | 2:00 |
1987 | 415 | 3:30 |
1988 | 65 | 3:15 |
1989 | 352 | 9:30 |
1990 | 0 | 0:00 |
1991 | 250 | 4:30 |
1992 | 0 | 3:00 |
1993 | 65 | 6:46 |
1994 | 40 | 1:00 |
1995 | 1167 | 9:45 |
1996 | 250 | 5:15 |
1997 | 820 | 6:15 |
1998 | 500 | 6:30 |
1999 | 20 | 4:15 |
2000 | 375 | 8:45 |
2001 | 1491 | 24:00 |
2002 | 142 | 11:30 |
2003 | 59 | 6:14 |
2004 | 2111 | 52:15 |
2005 | 12732 | 370:45 |
2006 | 8746 | 560:00 |
2007 | 1514 | 568:00 |
2008 | 5404 | 623:30 |
2009 | 973 | 346:10 |
2010 | 2500 | 257:51 |
2011 | 5996 | 379:30 |
2012 | 9250 | 474:30 |
2013 | 4681 | 449:30 |
2014 | 8091 | 366:57 |
2015 | 2445 | 241:57 |
2016 | 3378 | 386:02 |
2017 | 3363 | 309:56 |
2018 | 4757 | 319:16 |
2019 | 4933 | 243:15 |
2020 | 4035 | 304:06 |
2021 | 3483 | 186:53 |
2022 | 0 | 15:30 |